On Tue, Mar 1, 2016 at 11:12 AM, Phil Burk <philb...@mobileer.com> wrote:
> I use biquads in JSyn. The coefficients are calculated using RBJ's > excellent biquad cookbook from the music-dsp archives. > > I have found that I can recalculate and update the filter coefficients on > the fly without unpleasant artifacts. I do NOT zero out or modify the > internal state variables. I should think that setting them to zero would > sound pretty bad. > > Generally the filter settings are changed gradually using a knob or driven > by an LFO or envelope. > This last point is the key -- as long as you change the parameters slowly, you are *probably* okay simply updating the parameters. However, if your parameters are subject to rapid changes you need another solution. You can't get away with that in a DAW with automation, for example. bjorn -- Bjorn Roche @shimmeoapp
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